Tom, Bert, and William + March of the Machines + Extruder

How it works

Activate Extruder by sacrificing Tom, Bert, and William.
When Tom, Bert, and William die, they trigger, returning them from your graveyard to the battlefield as a noncreature artifact.
Because Tom, Bert, and William enter as a noncreature artifact, March of the Machines will then cause Tom, Bert, and William to be a 5/5 artifact creature.
Resolve the Extruder ability.
Repeat.

In which brackets is this combo allowed, per Spellbook's Spicy tier?

1–2 · Exhibition & Core

Spellbook classifies this as Spicy — not for these brackets.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.